Test moves, items, and abilities in battle

Thank you to SBird for providing mgba-rom-test binaries and Spikes/Toxic
Spikes tests!

Co-authored-by: sbird <sbird@no.tld>

tools/patchelf/Makefile

@@ -0,0 +1,18 @@
+.PHONY: all clean
+
+SRCS = patchelf.c
+
+ifeq ($(OS),Windows_NT)
+EXE := .exe
+else
+EXE :=
+endif
+
+all: patchelf$(EXE)
+	@:
+
+patchelf$(EXE): $(SRCS)
+	$(CC) $(SRCS) -o $@ $(LDFLAGS)
+
+clean:
+	$(RM) patchelf$(EXE)